The consumption of leftovers that have not been spoiled generally does not have a significant impact on the body, if consumed spoiled leftovers may cause gastrointestinal discomfort. If leftovers are properly preserved and stored for a short period of time without deterioration, consumption will generally not have a significant impact on the body. If you eat a long storage time or has been deteriorated meals, such as smell, color, texture and other changes in the meal, after eating may appear vomiting, diarrhea and other indigestion symptoms, and may even cause acute gastroenteritis. Leftovers stored for too long will produce bacteria or other harmful substances, such as green leafy vegetables not eaten, stored for too long may produce nitrite, long-term use of food containing nitrite, will cause serious damage to the body. Leftovers are best sealed and placed in the refrigerator for safekeeping and consumed as soon as possible. It is recommended that you try to eat fresh meals and less leftovers in your daily life. If you have leftovers, you should store them in the refrigerator in a timely manner, and it is generally recommended that you do not store them for more than one day. If the food is spoiled, do not eat it again. If you experience any discomfort after eating leftovers, go to the hospital.